#include"my_stdio.h"
#include<stdlib.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<sys/fcntl.h>
#include<string.h>
#include<unistd.h>
mFILE*mfopen(const char*filename,const char*mode)
{
    int fd=-1;
    if(strcmp(mode,"r")==0)
    {
        fd=open(filename,O_RDONLY);
    }else if(strcmp(mode,"w")==0)
    {
        fd=open(filename,O_CREAT|O_WRONLY|O_TRUNC,0666);
    }else if(strcmp(mode,"a")==0)
    {

        fd=open(filename,O_CREAT|O_WRONLY|O_APPEND,0666);
    }
    if(fd==-1) return NULL;
    mFILE*mf=(mFILE*)malloc(sizeof(mFILE));
    if(!mf) return NULL;
    mf->fileno=fd;
    mf->flag=FFLUSH_LINE;
    mf->cap=SIZE;
    mf->size=0;
    return mf;
}
void mfflush(mFILE*stream)
{
    if(stream->size>0)
    {
        write(stream->fileno,stream->outbuffer,stream->size);
        //刷新到外设
        stream->size=0;
    }
}
int mfwrite(const void*ptr,int num,mFILE*stream)
{
    //1.拷贝
    memcpy(stream->outbuffer+stream->size,ptr,num);
    stream->size+=num;
    
    //2.检测是否需要刷新
    if(stream->flag==FFLUSH_LINE&&stream->size>0&&stream->outbuffer[stream->size-1]=='\n')
    {
        mfflush(stream);
    }
    return num;
}
void mfclose(mFILE*stream)
{
    if(stream->size>0)
    {
        mfflush(stream);
    }
    close(stream->fileno);
}






//void mfflush(mFILE*stream);
//void mfclose(mFILE*stream);
